Injury to a child is a first-degree felony and carries the same punishment as murder five to 99 years or life in prison. Walker could also faces a capital murder charge since VaSean is a child under age 6.

Walker called 911 about 7:10 p.m. Sunday when VaSean stopped breathing, according to police reports. Medics tried to resuscitate the baby before taking him to the hospital.

The baby suffered no visible injuries, but a medical exam revealed conditions associated with shaken-baby syndrome, police spokesman Bill Morgan said. VaSean was unable to breath on his own and showed no signs of brain activity.

The emergency room pediatrician told police that VaSean had extensive retinal hemorrhaging heavy bleeding in his eye indicating he had been shaken violently, police reports said.

If the medical examiner rules VaSean's death a homicide, he would be the second baby murdered in Lubbock this month. Seven other young children were killed in Lubbock during the past two years.

On Jan. 10, Zachary Christensen suffered injuries consistent with blunt force and violent shaking, an autopsy revealed. Two weeks later, a grand jury indicted his father, 22-year-old Eric Christensen, on charges of injury to a child, murder and capital murder.